My aim is to see how the rate of reaction between magnesium and
hydrochloric acid is affected by changing the length of magnesium.

Hypothesis

I predict that if the length of magnesium is high then rate of
reaction will be much more longer because if the length of magnesium
is more then it will take longer to dissolve and therefore it will
react for a longer time.

First I will set up the experiment then I will put 15cm cubed of
hydrochloric acid and 15cm cubed of water inside the boiling tube. I
will then put in a 0.5cm long piece of magnesium into the tube and I
will start the stopwatch and I will see how long the magnesium reacts
for before dissolving in the solution.

The experiment will be repeated again on numerous occasions but the
length of magnesium will be changed. I will do this by adding 0.5cm to
the length of magnesium each time.

I will repeat the experiment in order to get some accurate results.
After repeating the experiments I will have two sets of results, I
will work out the average and then I will plot the graphs.

The way that my experiment will be made fair is that only one thing
will be changed and that is the length of magnesium but all the other
things that can have an effect on the outcome will be kept the same
e.g. temperature and volume of liquid. This experiment will be done at
room temperature therefore the temperature is the same all through the
experiment. The same concentration will be used through the
experiment. (The first experiment that I will do will look at the
effect different concentration has on the rate of reaction.)

During the experiment, goggles will be worn at all times for safety
precautions.

Results

Volume of HCL (cm cubed)

Volume of Water (cm cubed)

Concentration of solution

Length of

Magnesium

(In cm)

Exp 1

(In secs)

Exp 2

(In secs)

Average

Time

Rate 1/t

(X 10000)

15

15

1

0.5

60

56

58

172.41

15

15

1

1

92

98

98

102.04

15

15

1

1.5

106

110

110

90.91

15

15

1

2.0

121

125

123

81.30

15

15

1

2.5

151

146

148.5

67.34

From these results two graphs will be plotted, one on the average time
and one on the Rate 1/t (X 10000).

Conclusion

From my results, the conclusion that I have reached is that the
prediction which I made was correct and that the bigger the length
magnesium the longer the reacts for. This is because if the length of
magnesium is more then it will take longer to dissolve and therefore
it will react for a longer time.

As you can see on the graphs that I have drawn, as the length
increases so does the reaction time this proves that the prediction I
made was correct.

Evaluation

The experiment which I completed was done up to a high standard and
the results I got were quite good and seemed reliable as they backed
up my prediction.

I think that the experiment was done in a very well because I didn't
get any irregular result.

If I had a chance to do the experiment, again I would make sure that I
was working with someone because when I did the experiment I had to
put magnesium in the solution and then start the stopwatch and this
made the results less accurate, but if I was working with someone the
results would have been more precise.

Another drawback was that when I was waiting for magnesium to dissolve
and stop reacting I was looking with my eyes so therefore sometimes
the results I got would not be fair. Fairness in an issue like this
can be found in a light sensor. The light sensor will pass through the
boiling tube and the solution and send the results back to the
receiver this would enable me to tell whether the magnesium was still
reacting.

Another thing was that when the liquids were being measured they were
not done accurately because there was a shortage of time so everything
had to be done quickly and this caused the results to be less precise.

Overall, I think that this was a good experiment and the best that
could have been done with the time and resources available.

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